Finding the Fourth Proportional to 1,100.99, 1,648.28 and 947.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.99 : 1,648.28 = 947.90 : x
2. Step 2: Convert to fraction form
   1,100.99/1,648.28 = 947.90/x
3. Step 3: Cross multiply
   1,100.99x = 1,648.28 × 947.90
4. Step 4: Simplify right side
   1,100.99x = 1,562,391.63
5. Step 5: Solve for x
   x = 1,562,391.63/1,100.99
6. Step 6: Final answer
   x = 1,419.09